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Think you have a free roll of tape.winner!

As to the engine light as an owner of several Citroens over the last 40 years I can assure you of this.
1. If a light comes on and goes off after a restart, its probably nothing.
2. if a light comes on and goes off again, its probably nothing.
3. if a light comes on and stays on after a restart, its probably something! very few times does it mean your car is about to die.

so most times it's like a PC. Reboot.

If OBD2 says no then its a no!
we have had a lot of water recently!

If I had gone to the garage everytime an idiot light came on i'd have gone nuts. Citroen picasso was a case in point. that would throw an engine management light, the ECU then stores that and shows it for the next 10 starts and then drops the code (basically the engine didn't like being lugged). My C3 HDI threw a MAF code once. cleared it and did another 30-40K miles.

All that said most cars are the same, too clever for their own good.
 
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